I'm going out on a limb here, and guessing that Council not only wants to be involved, but doesn't want to waste time having their Division Leaders report back to them after the fact. Although it is more time consuming for us in the lower ranks to hear things that aren't completely relevant to our division, but it's easier for council. Like I said, I don't know, but it would just make sense to me.
I'm up for your idea though, that way I don't end up sitting at a 2 hour meeting just for the 2 minutes that our division gets the floor.
(although sometimes other division's questions are relevant to the community as a whole. But I don't really like to sieve through it all.)